Man, your own list is filled with a) third world countries, and b) actual terrorist attacks.
You're being disingenuous if you're trying to claim that, say, the Beslan School Siege is the same as the Columbine school shooting. One was committed by a terrorist organization with a political goal. The other was just a couple of fellow students.
Man what is the relevance of this comment? The existence of Beslan on that page has nothing to do with US shootings - the gp was just referring you to US stats that contradict your comment. Nothing to do with Beslan.